LM1276AAA National Semiconductor, LM1276AAA Datasheet - Page 42

• Manufacturer Part Number: LM1276AAA
• Description: 150 MHz I2C Compatible RGB Preamplifier with Internal 512 Character OSD ROM, 512 Character RAM and 4 DACs
• Manufacturer: National Semiconductor

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RSV
RSV
RSV
RSV
Auto Size Registers
Horizontal Flyback or Sync Duration:
Horizontal Back Porch Duration:
Vertical Front Porch Duration:
Vertical Sync Duration:
Vertical Back Porch Duration:
Bits 9–0
Bits 10–0
Bits 10–0
Bits 7–0
RSV
RSV
RSV
RSV
Reserved
Reserved
RSV
RSV
RSV
RSV
Reserved
Reserved
V_BP1 (0x858A)
H_BP1 (0x8585)
HF_S1 (0x8583)
V_FP1 (0x8587)
RSV
RSV
RSV
RSV
This is a 10-bit wide register that records the measured value of the horizontal flyback or sync
during video detect. When no video is detected, this register should return a value of zero. Once
measurement is completed and the auto size enable bit has cleared itself back to 0, the measured
data is ready to be read by the microcontroller. Reading this register before that may give
erroneous results. This register resets to default values, ready to record new measured values
when the auto size enable bit is set again.
This is an 11-bit wide register that records the lowest measured value of the horizontal back porch
during video detect. When no video is detected, the sum of this register and the horizontal flyback
or sync should be within 1 pixel of the total number of pixels per line. Once measurement is
completed and the auto size enable bit has cleared itself back to 0, the measured data is ready to
be read by the microcontroller. Reading this register before that may give erroneous results. This
register resets to default values, ready to record new measured values when the auto size enable
bit is set again.
This is an 11-bit wide register that records the lowest measured value of the vertical front porch in
terms of horizontal line periods during video detect. When no video is detected, this register should
return a value of zero. Once measurement is completed and the auto size enable bit has cleared
itself back to 0, the measured data is ready to be read by the microcontroller. Reading this register
before that may give erroneous results. This register resets to default values, ready to record new
measured values when the auto size enable bit is set again.
This is an 8-bit wide register that records the measured value of the vertical flyback or sync in
terms of horizontal line periods during video detect. Once measurement is completed and the auto
size enable bit has cleared itself back to 0, the measured data is ready to be read by the
microcontroller. Reading this register before that may give erroneous results. This register resets to
default values, ready to record new measured values when the auto size enable bit is set again.
RSV
RSV
RSV
RSV
(Continued)
RSV
Vertical Flyback or Sync Duration
V_SYN_D (0x8588)
VSYNC[7:0]
42
Horizontal Back Porch Duration
Vertical Back Porch Duration
Horizontal Flyback or Sync Duration
Vertical Front Porch Duration
HBP[10:0]
VBP[10:0]
VFP[10:0]
HFL_HS[9:0]
H_BP0 (0x8584)
V_BP0 (0x8589)
HF_S0 (0x8582)
V_FP0 (0x8586)